Position pointer of the electromagnetic induction type and electronic ink cartridge

Patent metadata

Field	Value
Publication number	US-9529458-B2
Application number	US-201514825849-A
Country	US
Kind code	B2
Filing date	Aug 13, 2015
Priority date	Jul 28, 2012
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

A position pointer is disclosed, in which an electronic ink cartridge of an electromagnetic induction type is accommodated. The electronic ink cartridge includes a resonance circuit having a coil and a capacitor circuit, and is configured to detect pressure applied to a core member accommodated in the position pointer based on a variation of a resonance frequency of the resonance circuit. The cartridge includes a tubular member, in which the core member and the coil are accommodated such that the coil is positioned between the core member, which extends outwardly from one end of the tubular member, and the capacitor circuit along a direction of a center axis of the tubular member. The cartridge also includes a connection member in the tubular member, which electrically connects a first end and a second end of the coil to a first terminal and a second terminal of the capacitor circuit, respectively.

First claim

The invention claimed is:

1. A coil module, configured to be included in a pen-shaped position pointer, the coil module comprising:
a magnetic core having a central axis and first and second axial ends,
a coil wound around the magnetic core, the coil including a first end and a second end,
a connection member having a central axis, first and second axial ends and a peripheral side surface defined between the first and second axial ends, the connection member being disposed such that its first axial end opposes and engages with the second axial end of the magnetic core and the central axis of the connection member is aligned with the central axis of the magnetic core, the peripheral side surface defining at least one recessed portion, and
at least one terminal member made of conductive material and having a first end part and a second end part, the first end part extending in a direction perpendicular to the peripheral side surface at the at least one recessed portion, the first end part of the at least one terminal being electrically connected to the first or second end of the coil, and the second end part of the at least one terminal member being led out from the second axial end of the connection member.

2. The coil module of claim 1 , comprising two of the terminal members, wherein the first end parts of the two terminal members respectively extend in the direction perpendicular to the peripheral side surface, and the first end parts of the two terminal members are electrically connected to the first and second ends of the coil, respectively.

3. The coil module of claim 1 , comprising two of the terminal members, wherein the peripheral side surface of the connection member defines two recessed portions, and the first end parts of the two terminal members respectively extend in directions perpendicular to the peripheral side surface at the two recessed portions, respectively, the first end parts of the two terminal members being electrically connected to the first and second ends of the coil, respectively.

4. The coil module of claim 1 , wherein the first end part extending in the direction perpendicular to the peripheral side surface does not protrude beyond the peripheral side surface.

5. The coil module of claim 1 , wherein the first end part of the at least one terminal member includes a notch that receives the first or second end of the coil.

6. The coil module of claim 1 , wherein the at least one recessed portion has an elongated shape extending along the central axis of the connection member.

7. The coil module of claim 6 , wherein the at least one recessed portion is a groove.

8. The coil module of claim 1 , wherein the connection member is made of non-magnetic material, and the at least one terminal member is inserted in the non-magnetic connection member.

9. The coil module of claim 1 , further comprising a positioning element that places the first axial end of the connection member relative to the second axial end of the magnetic core.

10. The coil module of claim 9 , wherein the positioning element is a protrusion provided on the first axial end of the connection member, and the second axial end of the magnetic core includes a recess sized to receive the protrusion of the connection member.

11. The coil module of claim 1 , wherein the magnetic core is made of ferrite material.

12. The coil module of claim 1 , wherein the magnetic core and the connection member respectively have a cylindrical shape, and an outer diameter of the coil wound around the magnetic core substantially equals an outer diameter of the connection member.

13. The coil module of claim 1 , further comprising a capacitor circuit disposed to oppose the second axial end of the connection member, the capacitor circuit being connected to the second end part of the at least one terminal member.

Assignees

• Wacom Co Ltd

Inventors

• Obata Masayuki

Classifications

• G06F3/046

  by electromagnetic means · CPC title

• G01B7/003

  for measuring position, not involving coordinate determination (coordinate measuring G01B7/004) · CPC title

• H01F38/00

  Adaptations of transformers or inductances for specific applications or functions · CPC title

• G06F3/03545 Primary

  Pens or stylus · CPC title

• G06F3/038

  Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry · CPC title